<html>
<head>
  <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
  <meta name="viewport" content="initial-scale=1.0, user-scalable=no" />
  <style type="text/css">
    body, html{width: 100%;height: 100%;margin:0;font-family:"微软雅黑";}
    #allmap{height:500px;width:100%;}
    #r-result{width:100%; font-size:14px;}
  </style>
  <script type="text/javascript" src="//api.map.baidu.com/api?v=2.0&ak=0FuoX30MFf7YMrdS5Wi9GGAcHBblKDuu"></script>
  <title>城市名定位</title>
</head>
<body>
<div id="allmap"></div>
<div id="r-result">
  经度: <input id="longitude" type="text" style="width:100px; margin-right:10px;" />
  纬度: <input id="latitude" type="text" style="width:100px; margin-right:10px;" />
  <input type="button" value="查询" onclick="theLocation()" />
</div>
</body>
</html>
<script type="text/javascript">
  // 百度地图API功能
  var map = new BMap.Map("allmap");
  map.centerAndZoom(new BMap.Point(116.331398,39.897445),11);
  map.enableScrollWheelZoom(true);

  // 用经纬度设置地图中心点
  function theLocation(){
    if(document.getElementById("longitude").value != "" && document.getElementById("latitude").value != ""){
      map.clearOverlays();
      var new_point = new BMap.Point(document.getElementById("longitude").value,document.getElementById("latitude").value);
      var marker = new BMap.Marker(new_point);  // 创建标注
      map.addOverlay(marker);              // 将标注添加到地图中
      map.panTo(new_point);
    }
  }
</script>
